Valve.



w. M. DAVIS.

VALVE.- APPLICATION FILED NOV-21' 1912.

1,136,589, mama Apr. 20, 1915.

OFFICE.

WILLIAM m. DAVIS, or AKRON, o nro.

/ VALVE.

7 1n 1s a specification.

his invention relates to improvements in valves for controlling the operation of power brakes for wheels, and 1s especially adapted for use with the brakes for the wheels of self-propelled vehicles such as automobiles.

The primary object of the invention is to provide a safe and efficient valve for brakes or automobiles in which the brake will be operated through the der pressure from a medium of a fluid unsuitable source of supand controlled through the instrumenta it of the valve, thelatter capable of controlhng the flow of fluid to the brake-actuating mechanism and capable of releasing the same at the will .of the operator.

With the foregoing and other objects in view, the invention consists in the novel construction, combination and arrangement of parts constituting, the invention to be hereinafter specifically described and illustrated in the accompanying drawings whichform a part hereof wherein is shown the 'pre-' ferred embodiment of the invention, but it is'to-be understood that changes, variations and modifications can be resorted to which come within the scope of the claim hereunto ap ended.

- n the drawings in which similar refer-- ence numerals indicate like parts in the different figures, Figure 1, is a" diagrammatic view of a-- brake mechanism embodyin this invention; Fig. 2, is'a vertical centra sectional view of a valve employed for "controllin the flow of fluid used for operating the bra e mechanism; Fig. 3, is a sectional view of the valve shown in Fig. 2 on line X thereof; and, Fig. 4, is a view similar to Fig. 3 on line Z thereof.

Referring to the drawings in detail, the

. reference numeral 1 denotes the brake flange when the lever is shifted of a wheel, (not shown), is a brake band 2, the ends of which are'connected to a lever 3'in such a manner that in one direction the band will be contracted on the flange 1 and Specification of Letters Patent.

general an elastic or resilient washer 15 'pose to be later described. Rotatably mounted within the casing 13 and immediately above the disk or closure and around which when shifted in the opposite direction the diameter of the band 2 will be increased and the rotation of the wheel permitted.

Connected by means, such for instance, as a link 4 with the lever 3 is a piston-rod. 5 bearing a piston 6 within a cylinder 7, to which asupply of fluid under ressure is conducted by'an inlet pipe 8. he opposite .end of the inlet pipe 8 is connected with a valve 9. Connect ng with the valve 9 through the medium of a ipe 10. is a source of supply of fluid under pressure, such, for instance,

4 Patented Apr. 20,4915; Application fljled November 21, 1912. Serial No. 732,688.

as a reservoir or tank 11.

The valve 9 is also provided with an outlet may discharge into the open -The foregoing description illustrates the arrangement of the mecha used for operating the brake. v

The valve which .I prefer to employ involves a cup-shaped casing 13 having the -lower interior wall nearthe open endthere of provided with screw threads to receive an exteriorly threaded disk 14. The disk 14 is provided with three interiorly threaded apertures with which are connected the ends of pipes 8, 10 and 12. The upper face of the disk or closure member 14 is counter-' bored surrounding the opening for the pipe 10 and in this counterbore or recess is placed for a purmember 14, is a valve 16 consisting of a disk having .a smooth lower face adapted to snugly fit against the upper face of the disk 14 and provided-with a valve stem 17 projecting through a suitable orifice 18 in the upper endof the casing 13. Above the cas-. ing 13 the valve stem 17 is squared at 19 to receive an operating lever 20 above which is a clamping nut 21 held in position through the "medium of a locking nut 22. Between the upper face of the valve 16 and the under face of the head of the casing'13 is a coiled resilient element 23 for constantly forcing the opposing faces of the members 14 and 16 into snug engagement. The under face of the valve 16 is provided with a recess 24 in which is placed a body 25 of resilient material such as rubber, for aflpurpose the source of supply to a If the valve is shifted through erably concentric. with the axis of the valve and of such a length and formation as to be capable of simultaneously establishing" communication between at least two of the termini of the pipes 8, 10 and 12.

In practice, a'fluid under pressure passes from thetank or storage supply 11 through If the lever the pipe 10 to the valve. is moved into oneposition the body of rubber is positioned immediately overthe end of the pipe 10 thereby closing the same and preventing the ingress of fluid into the valve casing. When the rubber closure member 25 is positioned over the end of the pipe 10 the recess 26 establishes communication between the termini ofthe 12 thereby permitting any flui contained in the cylinder 7' to escape. If the valve 16 is shifted into a position to bring the rubber closure member 25 over the end of the pipe 12 it brings the recess 26 into registration with the termini of the ipes 8 and 10, thereby permitting the fiuld to pass from' the cylinder 7 for to operate the brake. the medium of the lever 20 to bring the closure member operating the piston'6 25 over the termini of the pipe 8 to close it,

the recess 26 establishes communication between the termini of the pipes 10 and 12 thereby permitting the fluid in the reservoir 11 to escape through the exhaust 12.

(pipes 8 and I claim- L A power-brake valve comprising a ,cupshaped casing having its lower 0 en en interiorly screw-threaded; a threa ed disk having peripheral threads engaging the threads of the casing to secure the lower face of the disk flush with the lower end of the casing, said pipe-receiving o enings one of which is counterbored, sald disk serving as a valve seat, a rotary valve supported upon the disk and formed on its under face with a'circular recess and also with a recess concentric with the axis of the valve and of a length'to communicate simultaneously with two of said openings, a stem projectingl centrally from said valve and extending t opening in the end of said casing, an operating lever for said stem, a coilspring surrounding said stem and being confined between the end of the casin and the valve, a washer within the counter of said valve adapted to cooperate with the washer of the disk to close the opening surrounded by said washer.

In testimony whereof I'have hereunto set my hand in presence of two subscribing witnesses. I v

WILLIAM M. DAVIS.

Witnesses C. EIHUMP Y; A. L. MCCLI IIi OCK.

ore pf said disk, I and a rubber plug within the circular recessdisk having a plurality of rough an 

